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7-digit serial number; no CLR front filter; tripod knob to the right; without "High Speed" gearing and sticker and without focus-stop buttons; optically based on an SR-mount Minolta MD Apo Tele Rokkor 300mm f / 2.8 prototype; white finish Minolta AF Apo Tele 300mm f / 2.8 G (later revision) 2563-100, 2563-636: 25631 Prime 35mm 5-pin
A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
Bifocals. A bifocal lens with areas of differing magnification. Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [ sv]. Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism .
An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- ( a-) meaning "without" and ...
Many Leica M lenses went through several revisions through the years. Leica R lenses. Leica 15 mm f /3.5 Super-Elmar-R – 1980 (Carl Zeiss design) Leica 15 mm f /2.8 Super-Elmarit-R ASPH – 2001; Leica 16 mm f /2.8 Fisheye-Elmarit-R – 1970 (Minolta design and glass production) Ernst Leitz Canada Elmarit R19/2.8. Leica 19 mm f /2.8 Elmarit-R ...
Lea test. logMAR chart. An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [1] Eye charts are often used by health care professionals, such as optometrists, physicians and nurses, to screen persons for vision impairment.
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